Hi, I am trying to compute the moment of inertia of the Cavendish pendulum. I used I = 2(m r^2) r = gyration arm m = the weight attached to the pendulum But this formula is for a dumbell type of torsion pendulum where the weights are attached to the bar. Does anyone know the formula for a pendulum where the weights are suspended as in the case of the Cavendish pendulum? I couldn't find it online. With this formula I got I = 2 ( 729.8 * 93.1^2) = 12,651,243.56 g cm^2 Does this sound right for a pendulum of this dimensions? Thanks for your help.